Back brace



FIG. 1 is a perspective view of a back brace according to the invention;

FIG. 2 is a top plan view of the back brace depicted in FIG. 1.

FIG. 3 is a bottom plan view of the back brace depicted in FIG. 1.

FIG. 4 is a side elevation view of the back brace depicted in FIG. 1, the view from the opposite side being a mirror image thereof; and,

FIG. 5 is a perspective view of an assembled back brace depicted in FIG. 1.

It is understood that the dashed lines on the surface of the back brace indicate stitch lines which form part of the claimed design, while the short broken lines of the circular elements show portions of the back brace which form no part of the claimed design. 

I claim the ornamental design for back brace, as shown and described. 